If former North Carolina senator Elizabeth Dole thought she headed into her fateful 2008 re-election campaign with low approval ratings, what would she think about Sen. Richard Burr's (R-N.C.) numbers? A new PPP poll finds just 36% approving of the job Burr is doing as senator -- not much change from previous polls.

Tested against newly-announced Democratic challenger Kenneth Lewis, Burr leads 45%-31%, with a quarter of voters still undecided.

"It's pretty clear that Richard Burr is very vulnerable," said Dean Debnam,
president of North Carolina-based Public Policy Polling. "The only question is whether Roy Cooper is going to run, and what top tier candidate will be recruited if his answer to that question ends up being no."